JP7159303B2 - Anti-vibration device - Google Patents

Anti-vibration device Download PDF

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JP7159303B2
JP7159303B2 JP2020518349A JP2020518349A JP7159303B2 JP 7159303 B2 JP7159303 B2 JP 7159303B2 JP 2020518349 A JP2020518349 A JP 2020518349A JP 2020518349 A JP2020518349 A JP 2020518349A JP 7159303 B2 JP7159303 B2 JP 7159303B2
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liquid chamber
elastic body
mounting member
vibration
axial direction
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JPWO2019216403A1 (en
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勇樹 佐竹
励 御子柴
哲 植木
康寿之 長島
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株式会社プロスパイラ
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F16F13/04—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper
    • F16F13/06—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper
    • F16F13/08—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper
    • F16F13/10—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper the wall being at least in part formed by a flexible membrane or the like
    • F16F13/105—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper the wall being at least in part formed by a flexible membrane or the like characterised by features of partitions between two working chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F16F13/04—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper
    • F16F13/06—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper
    • F16F13/08—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper
    • F16F13/10—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper the wall being at least in part formed by a flexible membrane or the like
    • F16F13/105—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper the wall being at least in part formed by a flexible membrane or the like characterised by features of partitions between two working chambers
    • F16F13/107—Passage design between working chambers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K5/00—Arrangement or mounting of internal-combustion or jet-propulsion units
    • B60K5/12—Arrangement of engine supports
    • B60K5/1208—Resilient supports
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
    • F16F2228/001—Specific functional characteristics in numerical form or in the form of equations
    • F16F2228/005—Material properties, e.g. moduli
    • F16F2228/007—Material properties, e.g. moduli of solids, e.g. hardness
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2232/00—Nature of movement
    • F16F2232/08—Linear

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combined Devices Of Dampers And Springs (AREA)

Description

本発明は、例えば自動車や産業機械等に適用され、エンジン等の振動発生部の振動を吸収および減衰する防振装置に関する。
本願は、２０１８年５月１０日に日本に出願された特願２０１８－０９１４８３号に基づき優先権を主張し、その内容をここに援用する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device that is applied to, for example, automobiles, industrial machinery, etc., and that absorbs and attenuates vibrations of vibration-generating parts such as engines.
This application claims priority based on Japanese Patent Application No. 2018-091483 filed in Japan on May 10, 2018, the content of which is incorporated herein.

この種の防振装置として、従来から、振動発生部および振動受部のうちのいずれか一方に連結される筒状の第１取付部材、および他方に連結される第２取付部材と、これら両取付部材を弾性的に連結する弾性体と、液体が封入された第１取付部材内の液室を、弾性体を隔壁の一部に有する主液室および副液室に仕切る仕切部材と、仕切部材に設けられた収容室内に変形可能若しくは変位可能に収容された可動部材と、を備え、仕切部材に、主液室と副液室とを連通するオリフィス通路と、主液室と収容室とを連通する複数の第１連通孔と、副液室と収容室とを連通する第２連通孔と、が形成された構成が知られている。
この防振装置では、周波数が２００Ｈｚ未満の低周波振動のうち、比較的周波数の高いアイドル振動が軸方向に入力されたときに、可動部材を収容室内で変形若しくは変位させつつ、液室の液体を、第１連通孔、および第２連通孔を流通させることで、アイドル振動を減衰、吸収し、また、比較的周波数の低いシェイク振動が軸方向に入力されたときに、液室の液体を、オリフィス通路を流通させることで、シェイク振動を減衰、吸収する。As a vibration isolator of this type, conventionally, a cylindrical first mounting member connected to one of the vibration generating portion and the vibration receiving portion, and a second cylindrical mounting member connected to the other, are used. an elastic body for elastically connecting the mounting members; a partition member for dividing the liquid chamber in the first mounting member containing the liquid into a main liquid chamber and a secondary liquid chamber having the elastic body as a part of the partition; a movable member accommodated deformably or displaceably in a storage chamber provided in the member; an orifice passage connecting the main liquid chamber and the sub-liquid chamber in the partition member; and the main liquid chamber and the storage chamber. and a second communication hole communicating between the auxiliary liquid chamber and the storage chamber.
In this anti-vibration device, when idle vibration with a relatively high frequency among low-frequency vibrations with a frequency of less than 200 Hz is input in the axial direction, the movable member is deformed or displaced in the housing chamber, and the liquid in the liquid chamber is displaced. is passed through the first communicating hole and the second communicating hole to attenuate and absorb idling vibration, and when shake vibration with a relatively low frequency is input in the axial direction, the liquid in the liquid chamber is , orifice passages to attenuate and absorb shake vibrations.

日本国特開２００２－３２７７８９号公報Japanese Patent Application Laid-Open No. 2002-327789

しかしながら、前記従来の防振装置では、周波数が２００Ｈｚ～１０００Ｈｚの中周波振動を減衰、吸収することが難しい。 However, it is difficult for the conventional anti-vibration device to attenuate and absorb medium-frequency vibration with a frequency of 200 Hz to 1000 Hz.

本発明は前記事情に鑑みてなされたもので、中周波振動を減衰、吸収することができる防振装置を提供することを目的とする。 SUMMARY OF THE INVENTION It is an object of the present invention to provide a vibration isolator capable of damping and absorbing medium-frequency vibrations.

本発明に係る防振装置は、振動発生部および振動受部のうちのいずれか一方に連結される筒状の第１取付部材、および他方に連結される第２取付部材と、これら両取付部材を弾性的に連結する弾性体と、液体が封入された前記第１取付部材内の液室を、前記弾性体を隔壁の一部に有する主液室および副液室に、前記第１取付部材の中心軸線に沿う軸方向に仕切る仕切部材と、前記仕切部材に設けられた収容室内に変形可能若しくは変位可能に収容された可動部材と、を備え、前記仕切部材に、前記主液室と前記副液室とを連通するオリフィス通路と、前記主液室と前記収容室とを連通する複数の第１連通孔と、前記副液室と前記収容室とを連通する第２連通孔と、が形成され、前記仕切部材において、前記第１連通孔が開口し、かつ前記主液室の内面の一部を構成する第１壁面に、前記弾性体に向けて前記軸方向に突出する筒状部材が配設され、複数の前記第１連通孔は、前記第１壁面において、前記筒状部材の内側に位置する部分、および前記筒状部材の外側に位置する部分の双方に開口している。 A vibration isolator according to the present invention comprises a cylindrical first mounting member connected to one of a vibration generating portion and a vibration receiving portion, a cylindrical second mounting member connected to the other, and both of these mounting members. and a liquid chamber in the first mounting member, which is filled with liquid, is connected to the main liquid chamber and the sub-liquid chamber having the elastic body as a part of the partition wall, and the first mounting member. and a movable member accommodated in a housing chamber provided in the partition member so as to be deformable or displaceable, wherein the partition member includes the main liquid chamber and the An orifice passage that communicates with the secondary liquid chamber, a plurality of first communication holes that communicate with the main liquid chamber and the storage chamber, and a second communication hole that communicates with the secondary liquid chamber and the storage chamber. A tubular member that is formed in the partition member and protrudes in the axial direction toward the elastic body on a first wall surface that the first communication hole opens and that constitutes a part of the inner surface of the main liquid chamber. are provided, and the plurality of first communication holes are open to both a portion located inside the tubular member and a portion located outside the tubular member in the first wall surface.

本発明によれば、中周波振動を減衰、吸収することができる。 According to the present invention, intermediate frequency vibration can be damped and absorbed.

本発明の第１実施形態に係る防振装置の縦断面図である。1 is a vertical cross-sectional view of a vibration isolator according to a first embodiment of the present invention; FIG. 図１に示す防振装置のＡ－Ａ線矢視断面図である。FIG. 2 is a cross-sectional view of the anti-vibration device shown in FIG. 1 taken along the line AA. 本発明の第２実施形態に係る防振装置の縦断面図である。It is a longitudinal cross-sectional view of a vibration isolator according to a second embodiment of the present invention.

以下、本発明に係る防振装置の実施の形態について、図１および図２に基づいて説明する。
図１に示すように、防振装置１は、振動発生部および振動受部のいずれか一方に連結される筒状の第１取付部材１１と、振動発生部および振動受部のいずれか他方に連結される第２取付部材１２と、第１取付部材１１および第２取付部材１２を互いに弾性的に連結する弾性体１３と、液体が封入された第１取付部材１１内の液室１９を、弾性体１３を隔壁の一部に有する主液室１４および副液室１５に仕切る仕切部材１６と、仕切部材１６に設けられた収容室４２内に変形可能若しくは変位可能に収容された可動部材４１と、を備える液体封入型の防振装置である。An embodiment of a vibration isolator according to the present invention will be described below with reference to FIGS. 1 and 2. FIG.
As shown in FIG. 1, the vibration isolator 1 includes a cylindrical first mounting member 11 connected to one of the vibration generating portion and the vibration receiving portion, and a mounting member 11 connected to the other of the vibration generating portion and the vibration receiving portion. The second mounting member 12 to be connected, the elastic body 13 that elastically connects the first mounting member 11 and the second mounting member 12 to each other, and the liquid chamber 19 in the first mounting member 11 in which the liquid is sealed are A partition member 16 partitioning a main liquid chamber 14 and a sub-liquid chamber 15 having an elastic body 13 as a part of the partition wall, and a movable member 41 housed in a storage chamber 42 provided in the partition member 16 so as to be deformable or displaceable. and a liquid-enclosed vibration isolator.

以下、第１取付部材１１の中心軸線Ｏに沿う方向を軸方向という。また、軸方向に沿う第２取付部材１２側を上側、仕切部材１６側を下側という。また、防振装置１を軸方向から見た平面視において、中心軸線Ｏに交差する方向を径方向といい、中心軸線Ｏ周りに周回する方向を周方向という。
なお、第１取付部材１１、第２取付部材１２、および弾性体１３はそれぞれ、平面視で円形状若しくは円環状を呈し、中心軸線Ｏと同軸に配置されている。Hereinafter, the direction along the central axis O of the first mounting member 11 is referred to as the axial direction. In addition, the side of the second mounting member 12 along the axial direction is called the upper side, and the side of the partition member 16 is called the lower side. Further, in a planar view of the vibration isolator 1 viewed from the axial direction, the direction intersecting the central axis O is called the radial direction, and the direction rotating around the central axis O is called the circumferential direction.
The first mounting member 11, the second mounting member 12, and the elastic body 13 each have a circular shape or an annular shape in plan view, and are arranged coaxially with the central axis O. As shown in FIG.

この防振装置１が例えば自動車に装着される場合、第２取付部材１２が振動発生部としてのエンジン等に連結され、第１取付部材１１が振動受部としての車体に連結される。これにより、エンジン等の振動が車体に伝達することが抑えられる。なお、第１取付部材１１を振動発生部に連結し、第２取付部材１２を振動受部に連結してもよい。 When this anti-vibration device 1 is installed in an automobile, for example, the second mounting member 12 is connected to an engine or the like as a vibration generating portion, and the first mounting member 11 is connected to the vehicle body as a vibration receiving portion. This suppresses transmission of vibrations of the engine or the like to the vehicle body. Alternatively, the first mounting member 11 may be connected to the vibration generating portion and the second mounting member 12 may be connected to the vibration receiving portion.

第１取付部材１１は、内筒部１１ａ、外筒部１１ｂ、および下支持部１１ｃを備える。
内筒部１１ａは、外筒部１１ｂ内に嵌合されている。下支持部１１ｃは、環状に形成されている。下支持部１１ｃの外周部の上面に、外筒部１１ｂの下端開口縁が載置されている。第１取付部材１１は全体で円筒状に形成されている。第１取付部材１１は、図示されないブラケットを介して振動受部としての車体等に連結される。The first mounting member 11 includes an inner cylinder portion 11a, an outer cylinder portion 11b, and a lower support portion 11c.
The inner tubular portion 11a is fitted into the outer tubular portion 11b. The lower support portion 11c is formed in an annular shape. A lower opening edge of the outer cylindrical portion 11b is placed on the upper surface of the outer peripheral portion of the lower support portion 11c. The first mounting member 11 is formed in a cylindrical shape as a whole. The first mounting member 11 is connected to a vehicle body or the like as a vibration receiving portion via a bracket (not shown).

第２取付部材１２は、環状に形成されている。第２取付部材１２は、第１取付部材１１に対して径方向の内側で、かつ上方に位置している。第２取付部材１２の外径は、第１取付部材１１の内径より小さい。第２取付部材１２は、図示されない取付金具が内側に嵌合されることにより、この取付金具を介して振動発生部としてのエンジン等に連結される。
なお、第１取付部材１１および第２取付部材１２の相対的な位置は、図示の例に限らず適宜変更してもよい。また、第２取付部材１２の外径を、第１取付部材１１の内径以上としてもよい。The second mounting member 12 is formed in an annular shape. The second mounting member 12 is positioned radially inside and above the first mounting member 11 . The outer diameter of the second mounting member 12 is smaller than the inner diameter of the first mounting member 11 . The second mounting member 12 is connected to an engine or the like as a vibration generating section via a mounting bracket (not shown) fitted inside.
Note that the relative positions of the first mounting member 11 and the second mounting member 12 are not limited to the illustrated example and may be changed as appropriate. Also, the outer diameter of the second mounting member 12 may be equal to or greater than the inner diameter of the first mounting member 11 .

弾性体１３は、軸方向に延びる筒状に形成されている。弾性体１３は、上方から下方に向かうに従い漸次、拡径している。
弾性体１３の軸方向の両端部に、第１取付部材１１および第２取付部材１２が各別に連結されている。弾性体１３の上端部に第２取付部材１２が連結され、弾性体１３の下端部に第１取付部材１１が連結されている。弾性体１３は、第１取付部材１１の上端開口部を閉塞している。弾性体１３の下端部は、第１取付部材１１の内筒部１１ａの内周面に連結されている。弾性体１３の上端部は、第２取付部材１２の下面に連結されている。弾性体１３は、ゴム材料等により形成され、第１取付部材１１および第２取付部材１２に加硫接着されている。弾性体１３の厚さは、上方から下方に向かうに従い漸次、薄くなっている。なお、弾性体１３は、例えば合成樹脂材料等で形成してもよい。
弾性体１３の上端部に、第２取付部材１２の外周面、および上面を覆うストッパゴム１３ａが一体に形成されている。弾性体１３およびストッパゴム１３ａには、第２取付部材１２を囲う外殻体１２ａが埋設されている。The elastic body 13 is formed in a tubular shape extending in the axial direction. The elastic body 13 gradually expands in diameter from top to bottom.
A first mounting member 11 and a second mounting member 12 are separately connected to both ends of the elastic body 13 in the axial direction. The second mounting member 12 is connected to the upper end of the elastic body 13 , and the first mounting member 11 is connected to the lower end of the elastic body 13 . The elastic body 13 closes the upper end opening of the first mounting member 11 . A lower end portion of the elastic body 13 is connected to the inner peripheral surface of the inner cylindrical portion 11 a of the first mounting member 11 . The upper end of the elastic body 13 is connected to the lower surface of the second mounting member 12 . The elastic body 13 is formed of a rubber material or the like, and is vulcanized and bonded to the first mounting member 11 and the second mounting member 12 . The thickness of the elastic body 13 gradually decreases from top to bottom. Note that the elastic body 13 may be formed of, for example, a synthetic resin material.
A stopper rubber 13 a covering the outer peripheral surface and the upper surface of the second mounting member 12 is formed integrally with the upper end portion of the elastic body 13 . An outer shell 12a surrounding the second mounting member 12 is embedded in the elastic body 13 and the stopper rubber 13a.

ダイヤフラム２０は、ゴムや軟質樹脂等の弾性材料からなり、有底円筒状に形成されている。ダイヤフラム２０の上端部が、第１取付部材１１の下支持部１１ｃの内周部と、仕切部材１６の外周部と、により挟まれることで、ダイヤフラム２０の内側の液密性が確保され、かつ第１取付部材１１の下端開口部が閉塞されている。
なお図示の例では、ダイヤフラム２０の底部が、外周側で深く中央部で浅い形状になっている。ただし、ダイヤフラム２０の形状としては、このような形状以外にも、従来公知の種々の形状を採用することができる。The diaphragm 20 is made of an elastic material such as rubber or soft resin, and is formed in a cylindrical shape with a bottom. The upper end portion of the diaphragm 20 is sandwiched between the inner peripheral portion of the lower support portion 11c of the first mounting member 11 and the outer peripheral portion of the partition member 16, thereby ensuring liquid tightness inside the diaphragm 20, and A lower end opening of the first mounting member 11 is closed.
In the illustrated example, the bottom portion of the diaphragm 20 is deep at the outer peripheral side and shallow at the central portion. However, as the shape of the diaphragm 20, various conventionally known shapes can be adopted besides such a shape.

ここで、前述したように、弾性体１３が第１取付部材１１の上端開口部を閉塞し、かつダイヤフラム２０が第１取付部材１１の下端開口部を閉塞したことにより、第１取付部材１１内が液密に封止された液室１９となっている。この液室１９に液体が封入（充填）されている。液体としては、例えばエチレングリコール、水、若しくはシリコーンオイル等が挙げられる。 Here, as described above, since the elastic body 13 closes the upper end opening of the first mounting member 11 and the diaphragm 20 closes the lower end opening of the first mounting member 11, the inside of the first mounting member 11 is closed. is a liquid chamber 19 that is liquid-tightly sealed. A liquid is enclosed (filled) in the liquid chamber 19 . Liquids include, for example, ethylene glycol, water, or silicone oil.

液室１９は、仕切部材１６によって軸方向に主液室１４と副液室１５とに区画されている。主液室１４は、弾性体１３の内周面１３ｃを壁面の一部に有し、弾性体１３と仕切部材１６とによって囲まれた空間であり、弾性体１３の変形によって内容積が変化する。副液室１５は、ダイヤフラム２０と仕切部材１６とによって囲まれた空間であり、ダイヤフラム２０の変形によって内容積が変化する。このような構成からなる防振装置１は、主液室１４が鉛直方向上側に位置し、副液室１５が鉛直方向下側に位置するように取り付けられて用いられる、圧縮式の装置である。 The liquid chamber 19 is axially partitioned into a main liquid chamber 14 and a sub liquid chamber 15 by a partition member 16 . The main liquid chamber 14 has an inner peripheral surface 13c of the elastic body 13 as part of its wall surface, is a space surrounded by the elastic body 13 and the partition member 16, and changes its internal volume as the elastic body 13 deforms. . The sub-liquid chamber 15 is a space surrounded by the diaphragm 20 and the partition member 16 , and its internal volume changes as the diaphragm 20 deforms. The anti-vibration device 1 having such a configuration is a compression type device which is mounted so that the main liquid chamber 14 is positioned vertically upward and the auxiliary liquid chamber 15 is positioned vertically downward. .

仕切部材１６に、主液室１４と収容室４２とを連通する複数の第１連通孔４２ａと、副液室１５と収容室４２とを連通する第２連通孔４２ｂと、が形成されている。第２連通孔４２ｂは仕切部材１６に複数形成され、第１連通孔４２ａおよび第２連通孔４２ｂの各個数は互いに同じになっている。第１連通孔４２ａおよび第２連通孔４２ｂの各内径は互いに同じになっている。なお、第２連通孔４２ｂは仕切部材１６に１つ形成してもよい。 The partition member 16 is formed with a plurality of first communication holes 42a communicating between the main liquid chamber 14 and the storage chamber 42, and second communication holes 42b communicating between the secondary liquid chamber 15 and the storage chamber 42. . A plurality of second communication holes 42b are formed in the partition member 16, and the numbers of the first communication holes 42a and the numbers of the second communication holes 42b are the same. The inner diameters of the first communicating hole 42a and the inner diameter of the second communicating hole 42b are the same. One second communication hole 42 b may be formed in the partition member 16 .

ここで、仕切部材１６において、主液室１４の内面の一部を構成する上壁面、および副液室１５の内面の一部を構成する下壁面はそれぞれ、軸方向から見て、中心軸線Ｏと同軸に配置された円形状を呈する。仕切部材１６における上壁面および下壁面の各直径は互いに同等になっている。仕切部材１６の上壁面は、弾性体１３の内周面１３ｃに軸方向で対向し、仕切部材１６の下壁面は、ダイヤフラム２０の内面に軸方向で対向している。 Here, in the partition member 16, the upper wall surface forming a part of the inner surface of the main liquid chamber 14 and the lower wall surface forming a part of the inner surface of the sub-liquid chamber 15 each have a central axis O when viewed from the axial direction. It has a circular shape arranged coaxially with the The diameters of the upper wall surface and the lower wall surface of the partition member 16 are equal to each other. The upper wall surface of the partition member 16 faces the inner peripheral surface 13c of the elastic body 13 in the axial direction, and the lower wall surface of the partition member 16 faces the inner surface of the diaphragm 20 in the axial direction.

図示の例では、仕切部材１６の上壁面に、外周縁部１６ａを除く全域にわたって窪み部が形成されている。この窪み部の底面（以下、第１壁面という）１６ｂの全域にわたって、複数の第１連通孔４２ａが開口している。仕切部材１６の下壁面に、外周縁部１６ｃを除く全域にわたって窪み部が形成されている。この窪み部の底面（以下、第２壁面という）１６ｄの全域にわたって、複数の第２連通孔４２ｂが開口している。上壁面および下壁面の各窪み部は、軸方向から見て、中心軸線Ｏと同軸に配置された円形状を呈し、各窪み部の内径および深さなどの大きさは互いに同等になっている。 In the illustrated example, the upper wall surface of the partition member 16 is formed with a recess over the entire area except for the outer peripheral edge portion 16a. A plurality of first communication holes 42a are open over the entire bottom surface (hereinafter referred to as first wall surface) 16b of the recess. A depression is formed in the lower wall surface of the partition member 16 over the entire area except for the outer peripheral edge 16c. A plurality of second communication holes 42b are open over the entire bottom surface (hereinafter referred to as a second wall surface) 16d of this recessed portion. Each depression on the upper wall surface and the lower wall surface has a circular shape arranged coaxially with the central axis O when viewed from the axial direction, and the sizes such as the inner diameter and depth of each depression are equal to each other. .

収容室４２は、仕切部材１６において、第１壁面１６ｂと第２壁面１６ｄとの軸方向の間に位置する部分に形成されている。収容室４２は、軸方向から見て、中心軸線Ｏと同軸に配置された円形状を呈する。収容室４２の直径は、第１壁面１６ｂおよび第２壁面１６ｄの各直径より大きい。
可動部材４１は、例えばゴム材料等で形成され表裏面が軸方向を向く板状に形成されている。可動部材４１は、軸方向から見て、中心軸線Ｏと同軸に配置された円形状を呈する。The storage chamber 42 is formed in a portion of the partition member 16 located between the first wall surface 16b and the second wall surface 16d in the axial direction. The housing chamber 42 has a circular shape coaxial with the central axis O when viewed from the axial direction. The diameter of the storage chamber 42 is larger than each diameter of the first wall surface 16b and the second wall surface 16d.
The movable member 41 is formed of, for example, a rubber material or the like, and is formed in a plate shape having front and back surfaces facing the axial direction. The movable member 41 has a circular shape coaxial with the central axis O when viewed from the axial direction.

仕切部材１６に、主液室１４と副液室１５とを連通するオリフィス通路２４が形成されている。オリフィス通路２４は、仕切部材１６において、上壁面の外周縁部１６ａと下壁面の外周縁部１６ｃとの軸方向の間に位置する部分に形成されている。オリフィス通路２４の上端は、第１壁面１６ｂより上方に位置し、オリフィス通路２４の下端は、第２壁面１６ｄより下方に位置している。オリフィス通路２４の流路断面形状は、軸方向に長い長方形状となっている。オリフィス通路２４の共振周波数は、第１連通孔４２ａおよび第２連通孔４２ｂの各共振周波数より低い。 An orifice passage 24 that communicates the main liquid chamber 14 and the sub-liquid chamber 15 is formed in the partition member 16 . The orifice passage 24 is formed in a portion of the partition member 16 located between the outer peripheral edge portion 16a of the upper wall surface and the outer peripheral edge portion 16c of the lower wall surface in the axial direction. The upper end of the orifice passage 24 is located above the first wall surface 16b, and the lower end of the orifice passage 24 is located below the second wall surface 16d. The cross-sectional shape of the orifice passage 24 is a rectangular shape elongated in the axial direction. The resonance frequency of the orifice passage 24 is lower than the resonance frequencies of the first communication hole 42a and the second communication hole 42b.

図２に示されるように、オリフィス通路２４における主液室１４側の開口部２５は、仕切部材１６の上壁面の外周縁部１６ａに形成されている。この開口部２５は、貫通孔２５ａが周方向に間隔をあけて複数配置されてなる孔列２５ｂが、径方向および周方向の各位置を異ならせて複数配置されて構成されている。貫通孔２５ａの内径は、第１連通孔４２ａの内径より小さい。孔列２５ｂは、仕切部材１６の上壁面の外周縁部１６ａに２つ配置されている。各孔列２５ｂの周方向のずれ量、および各孔列２５ｂの径方向のずれ量はそれぞれ、貫通孔２５ａの内径と同等になっている。 As shown in FIG. 2 , the opening 25 of the orifice passage 24 on the side of the main liquid chamber 14 is formed in the outer peripheral edge 16 a of the upper wall surface of the partition member 16 . The opening 25 is formed by arranging a plurality of hole rows 25b in which a plurality of through holes 25a are arranged at intervals in the circumferential direction at different positions in the radial direction and the circumferential direction. The inner diameter of the through hole 25a is smaller than the inner diameter of the first communication hole 42a. Two hole rows 25 b are arranged on the outer peripheral edge portion 16 a of the upper wall surface of the partition member 16 . The amount of displacement in the circumferential direction of each row of holes 25b and the amount of displacement in the radial direction of each row of holes 25b are equal to the inner diameter of the through hole 25a.

オリフィス通路２４の副液室１５側の開口部は、仕切部材１６の下壁面の外周縁部１６ｃに形成され、主液室１４側の開口部２５の開口面積、つまり複数の貫通孔２５ａの開口面積の総和より開口面積が大きい１つの開口となっている。オリフィス通路２４における主液室１４側の開口部２５および副液室１５側の開口部は、第１連通孔４２ａ、および第２連通孔４２ｂより径方向の外側に位置している。 The opening of the orifice passage 24 on the side of the secondary liquid chamber 15 is formed in the outer peripheral edge portion 16c of the lower wall surface of the partition member 16, and the opening area of the opening 25 on the side of the main liquid chamber 14, that is, the opening of the plurality of through holes 25a It is one opening whose opening area is larger than the sum of the areas. The opening 25 of the orifice passage 24 on the side of the main liquid chamber 14 and the opening on the side of the sub-liquid chamber 15 are located radially outside the first communication hole 42a and the second communication hole 42b.

仕切部材１６の上端部には、径方向の外側に向けて突出し全周にわたって連続して延びるフランジ部１６ｅが形成されている。フランジ部１６ｅの上面は、第１取付部材１１における内筒部１１ａおよび外筒部１１ｂの各下端開口縁に、環状の上側シール材２７を介して当接している。フランジ部１６ｅの下面は、第１取付部材１１の下支持部１１ｃの内周部の上面に、ダイヤフラム２０の上端開口縁、およびダイヤフラム２０の上端開口縁を径方向の外側から囲う環状の下側シール材２８を介して当接している。 An upper end portion of the partition member 16 is formed with a flange portion 16e that protrudes radially outward and continuously extends over the entire circumference. The upper surface of the flange portion 16 e abuts the lower opening edges of the inner cylinder portion 11 a and the outer cylinder portion 11 b of the first mounting member 11 via an annular upper seal member 27 . The lower surface of the flange portion 16e is formed on the upper surface of the inner peripheral portion of the lower support portion 11c of the first mounting member 11, the upper opening edge of the diaphragm 20, and the annular lower surface surrounding the upper opening edge of the diaphragm 20 from the outside in the radial direction. They are in contact with each other via a sealing material 28 .

仕切部材１６は、互いに軸方向に突き合わされて配置された上筒体３１および下筒体３２と、上筒体３１の下端開口部を閉塞する上壁３３と、下筒体３２の上端開口部を閉塞する下壁３４と、を備える。なお、仕切部材１６は一体に形成されてもよい。 The partition member 16 includes an upper cylinder 31 and a lower cylinder 32 which are arranged facing each other in the axial direction, an upper wall 33 closing the lower end opening of the upper cylinder 31, and an upper end opening of the lower cylinder 32. a lower wall 34 that closes the . In addition, the partition member 16 may be integrally formed.

上筒体３１の上端開口縁が、前述した仕切部材１６の上壁面の外周縁部１６ａとなっている。上筒体３１の上端部にフランジ部１６ｅが形成されている。上筒体３１の下端開口縁において、内周部より径方向の外側に位置する部分に、上方に向けて窪み、かつ径方向の外側に向けて開口した周溝が形成されている。
上壁３３は、上筒体３１の下端開口縁における内周部に固定されている。上壁３３に第１連通孔４２ａが形成されている。The upper end opening edge of the upper cylindrical body 31 forms the outer peripheral edge portion 16a of the upper wall surface of the partition member 16 described above. A flange portion 16 e is formed at the upper end portion of the upper cylindrical body 31 . A peripheral groove that is recessed upward and opens radially outward is formed in a portion of the lower opening edge of the upper cylinder 31 located radially outward from the inner peripheral portion.
The upper wall 33 is fixed to the inner peripheral portion of the lower end opening edge of the upper cylindrical body 31 . A first communication hole 42 a is formed in the upper wall 33 .

下筒体３２の上端開口縁において、上筒体３１の周溝と軸方向で対向する径方向の中間部分に、下方に向けて窪む周溝が形成されている。この周溝と、上筒体３１の周溝と、によりオリフィス通路２４が画成されている。下筒体３２の上端開口縁において、周溝より径方向の外側に位置する外周縁部が、上筒体３１のフランジ部１６ｅの下面に当接している。下筒体３２は、ダイヤフラム２０の上端部内に嵌合され、ダイヤフラム２０の上端部は、第１取付部材１１の下支持部１１ｃ内に嵌合されている。これにより、ダイヤフラム２０の上端部は、下筒体３２の外周面と下支持部１１ｃの内周面とにより径方向に挟まれている。
下壁３４は、下筒体３２の上端開口縁における内周部に固定されている。下壁３４に第２連通孔４２ｂが形成されている。A circumferential groove recessed downward is formed in a radially intermediate portion of the upper end opening edge of the lower cylindrical body 32 that faces the circumferential groove of the upper cylindrical body 31 in the axial direction. The orifice passage 24 is defined by this circumferential groove and the circumferential groove of the upper cylindrical body 31 . At the upper end opening edge of the lower cylinder 32 , the outer peripheral edge located radially outside the circumferential groove abuts the lower surface of the flange portion 16 e of the upper cylinder 31 . The lower cylindrical body 32 is fitted into the upper end portion of the diaphragm 20 , and the upper end portion of the diaphragm 20 is fitted into the lower support portion 11 c of the first mounting member 11 . Thereby, the upper end portion of the diaphragm 20 is radially sandwiched between the outer peripheral surface of the lower cylindrical body 32 and the inner peripheral surface of the lower support portion 11c.
The lower wall 34 is fixed to the inner peripheral portion of the upper opening edge of the lower cylindrical body 32 . A second communication hole 42b is formed in the lower wall 34 .

上筒体３１の下端開口縁における内周部、および下筒体３２の上端開口縁における内周部のうちの少なくとも一方に、他方に向けて突出して当接する突き当て突起３４ａ、３４ｂが形成されている。図示の例では、上筒体３１の下端開口縁における内周部、および下筒体３２の上端開口縁における内周部の双方に、突き当て突起３４ａ、３４ｂが形成されている。突き当て突起３４ａ、３４ｂは、中心軸線Ｏと同軸に配置された環状に形成され、その径方向の内側に、上壁３３および下壁３４が、互いに軸方向に隙間をあけた状態で配設されている。収容室４２は、上壁３３の下面、下壁３４の上面、および突き当て突起３４ａ、３４ｂの内周面により画成されている。 At least one of the inner peripheral portion of the lower opening edge of the upper cylinder 31 and the inner peripheral portion of the upper opening edge of the lower cylinder 32 is formed with abutment projections 34a and 34b that protrude toward and abut on the other. ing. In the illustrated example, abutting protrusions 34a and 34b are formed on both the inner periphery of the lower opening edge of the upper cylinder 31 and the inner periphery of the upper opening edge of the lower cylinder 32 . The abutment projections 34a and 34b are annularly arranged coaxially with the central axis O, and the upper wall 33 and the lower wall 34 are arranged radially inwardly of the projections 34a and 34b with a gap therebetween in the axial direction. It is The accommodation chamber 42 is defined by the lower surface of the upper wall 33, the upper surface of the lower wall 34, and the inner peripheral surfaces of the abutment projections 34a and 34b.

そして、本実施形態では、仕切部材１６において、第１連通孔４２ａが開口し、かつ主液室１４の内面の一部を構成する第１壁面１６ｂに、弾性体１３に向けて軸方向に突出する筒状部材２１が配設されている。 In this embodiment, in the partition member 16 , the first communication hole 42 a is open and protrudes in the axial direction toward the elastic body 13 on the first wall surface 16 b forming part of the inner surface of the main liquid chamber 14 . A cylindrical member 21 is provided for the purpose.

筒状部材２１は、円筒状に形成され、中心軸線Ｏと同軸に配置されている。筒状部材２１は、軸方向に真直ぐ延びている。筒状部材２１の軸方向の長さは、主液室１４の軸方向の最大高さＴの２０％以上となっている。図示の例では、主液室１４の軸方向の最大高さＴは、下方から上方に向かうに従い漸次、径方向の内側に向けて延びる、弾性体１３の内周面１３ｃにおける上端部と、第１壁面１６ｂと、の軸方向の距離となっている。筒状部材２１の軸方向の長さは、防振装置１に軸方向の静荷重が加えられたとき、および軸方向の振動が入力されたときに、筒状部材２１の上端部が弾性体１３の内周面１３ｃに当接しないように設定される。 The tubular member 21 is formed in a cylindrical shape and arranged coaxially with the central axis O. As shown in FIG. The tubular member 21 extends straight in the axial direction. The axial length of the cylindrical member 21 is 20% or more of the maximum axial height T of the main liquid chamber 14 . In the illustrated example, the maximum axial height T of the main liquid chamber 14 is the upper end portion of the inner peripheral surface 13c of the elastic body 13, which gradually extends radially inward from the lower side to the upper side, 1 wall surface 16b and the distance in the axial direction. The length of the tubular member 21 in the axial direction is such that the upper end portion of the tubular member 21 becomes an elastic body when a static load in the axial direction is applied to the vibration isolator 1 and when vibration in the axial direction is input. 13 is set so as not to come into contact with the inner peripheral surface 13c.

筒状部材２１の上部は、仕切部材１６の上壁面に形成された窪み部の上端開口部から上方に突出している。筒状部材２１の上部の外周面は、第１取付部材１１の内筒部１１ａの内周面における下端部、および弾性体１３の内周面１３ｃにおける下端部と径方向で対向している。筒状部材２１の上部の、窪み部の上端開口部からの突出長さは、この窪み部の深さより短い。また、前記突出長さは、弾性体１３の内周面１３ｃにおいて、筒状部材２１の上端開口縁が軸方向で対向する部分と、筒状部材２１の上端開口縁と、の軸方向の距離より短い。下方から上方に向かうに従い漸次、径方向の内側に向けて延びる、弾性体１３の内周面１３ｃのうち、軸方向に沿う縦断面視において、この内周面１３ｃの延びる方向における中央部より下側にずれた部分に、筒状部材２１の上端開口縁が軸方向に対向している。 The upper portion of the tubular member 21 protrudes upward from the upper end opening of the depression formed in the upper wall surface of the partition member 16 . The outer peripheral surface of the upper portion of the tubular member 21 radially faces the lower end portion of the inner peripheral surface of the inner tubular portion 11 a of the first mounting member 11 and the lower end portion of the inner peripheral surface 13 c of the elastic body 13 . The projection length of the upper portion of the cylindrical member 21 from the upper end opening of the recess is shorter than the depth of the recess. The projection length is the axial distance between the portion of the inner peripheral surface 13c of the elastic body 13 where the upper end opening edge of the tubular member 21 faces in the axial direction and the upper end opening edge of the tubular member 21. shorter. Of the inner peripheral surface 13c of the elastic body 13, which gradually extends inward in the radial direction from the bottom to the top, in a vertical cross-sectional view along the axial direction, below the central portion in the direction in which the inner peripheral surface 13c extends The upper end opening edge of the cylindrical member 21 is axially opposed to the portion shifted to the side.

筒状部材２１の内周面の半径は、筒状部材２１の外周面と、仕切部材１６の上壁面に形成された窪み部の内周面と、の径方向の間隔より大きい。筒状部材２１の内径は、主液室１４の最大内径Ｒの半分以上となっている。図示の例では、主液室１４の最大内径Ｒは、第１取付部材１１の内筒部１１ａの下端部の内径となっている。第１壁面１６ｂにおいて、筒状部材２１の内側に位置する部分（以下、内側部分という）１６ｆの平面積は、筒状部材２１の外側に位置する部分（以下、外側部分という）１６ｇの平面積より大きい。 The radius of the inner peripheral surface of the tubular member 21 is larger than the radial distance between the outer peripheral surface of the tubular member 21 and the inner peripheral surface of the recess formed in the upper wall surface of the partition member 16 . The inner diameter of the cylindrical member 21 is half or more of the maximum inner diameter R of the main liquid chamber 14 . In the illustrated example, the maximum inner diameter R of the main liquid chamber 14 is the inner diameter of the lower end portion of the inner tubular portion 11 a of the first mounting member 11 . In the first wall surface 16b, the plane area of the portion (hereinafter referred to as the inner portion) 16f located inside the tubular member 21 is the plane area of the portion (hereinafter referred to as the outer portion) 16g located outside the tubular member 21. greater than

複数の第１連通孔４２ａは、第１壁面１６ｂにおける内側部分１６ｆおよび外側部分１６ｇの双方に開口している。
内側部分１６ｆに開口する第１連通孔４２ａの開口面積の総和は、外側部分１６ｇに開口する第１連通孔４２ａの開口面積の総和より大きい。第１連通孔４２ａは、内側部分１６ｆにおける全域にわたって等間隔をあけて配置されている。第１連通孔４２ａは、外側部分１６ｇに、等間隔をあけて全周にわたって配置されている。互いに隣り合う第１連通孔４２ａ同士の間隔は、第１連通孔４２ａの内径より小さい。
筒状部材２１は、第１壁面１６ｂにおいて、隣り合う第１連通孔４２ａ同士の間に位置する部分に連結され、第１連通孔４２ａと重複しないように配設されている。筒状部材２１は、軸方向から見て、内周面および外周面が第１連通孔４２ａに接するように配置されている。The plurality of first communication holes 42a are open to both the inner portion 16f and the outer portion 16g of the first wall surface 16b.
The total opening area of the first communication holes 42a opening to the inner portion 16f is larger than the total opening area of the first communication holes 42a opening to the outer portion 16g. The first communication holes 42a are arranged at equal intervals over the entire area of the inner portion 16f. The first communication holes 42a are arranged along the entire circumference of the outer portion 16g at regular intervals. The interval between the first communication holes 42a adjacent to each other is smaller than the inner diameter of the first communication holes 42a.
The tubular member 21 is connected to a portion of the first wall surface 16b located between adjacent first communication holes 42a, and is arranged so as not to overlap with the first communication holes 42a. The cylindrical member 21 is arranged such that the inner peripheral surface and the outer peripheral surface are in contact with the first communication hole 42a when viewed in the axial direction.

このような構成からなる防振装置１では、低周波振動のうち、比較的周波数の高いアイドル振動が軸方向に入力されると、収容室４２内で可動部材４１が変形若しくは変位しつつ、液室１９の液体が第１連通孔４２ａおよび第２連通孔４２ｂを流通することで、この振動が減衰、吸収される。また、低周波振動のうち、比較的周波数の低いシェイク振動が軸方向に入力されると、液室１９の液体がオリフィス通路２４を流通することで、この振動が減衰、吸収される。 In the anti-vibration device 1 having such a configuration, when the idle vibration having a relatively high frequency among the low-frequency vibrations is input in the axial direction, the movable member 41 is deformed or displaced in the housing chamber 42, causing the liquid to move. This vibration is damped and absorbed by the liquid in the chamber 19 flowing through the first communication hole 42a and the second communication hole 42b. When shake vibration, which has a relatively low frequency among low-frequency vibrations, is input in the axial direction, the liquid in the liquid chamber 19 flows through the orifice passage 24, thereby attenuating and absorbing this vibration.

以上説明したように、本実施形態に係る防振装置１によれば、仕切部材１６の第１壁面１６ｂに、弾性体１３に向けて突出する筒状部材２１が配設されている。このため、軸方向の中周波振動の入力にともない、軸方向に沿う縦断面視において、弾性体１３が二次の振動モードで変形するときに、従来は弾性体１３の中央部に生じていた節部分が、例えば、主液室１４の内周面と筒状部材２１の上部の外周面との間の液体が流動しにくくなることなどに起因して、第２取付部材１２側にずれることとなり、弾性体１３において、節部分より第２取付部材１２側に位置する部分と比べて、節部分より第１取付部材１１側に位置する部分が変形しやすくなる。これにより、軸方向の中周波振動の入力時に、弾性体１３において、節部分より第１取付部材１１側に位置する部分が積極的に変形することとなり、弾性体１３の剛性を見かけ上低減することが可能になり、この振動を減衰、吸収することができる。
また、本実施形態に係る防振装置１によれば、主液室１４の液圧をコントロールすることでも中周波振動を低減することが可能である。
例えば、孔の総面積が同じ場合、振動等の入力があった場合の主液室１４の液圧は、仕切部材１６に設けられた孔形状の違いに起因して異なる。
同様に、仕切部材１６に筒状部材２１を配置した場合も、筒状部材２１がない場合とは、振動等の入力があった場合の主液室１４の液圧が異なる。
筒状部材２１を用いることで、防振装置１の軸方向及び径方向で主液室１４の領域が分けられ、それぞれの領域が相互に作用することで、従来とは異なり、中周波振動を低減可能と考えられる。As described above, according to the vibration isolator 1 according to the present embodiment, the cylindrical member 21 projecting toward the elastic body 13 is arranged on the first wall surface 16b of the partition member 16 . For this reason, when the elastic body 13 is deformed in the secondary vibration mode in a vertical cross-sectional view along the axial direction with the input of the intermediate-frequency vibration in the axial direction, conventional deformation occurs at the central portion of the elastic body 13 . The node portion is shifted toward the second mounting member 12 due to, for example, difficulty in fluid flow between the inner peripheral surface of the main liquid chamber 14 and the outer peripheral surface of the upper portion of the cylindrical member 21. Therefore, in the elastic body 13, the portion positioned closer to the first mounting member 11 than the joint portion is more likely to deform than the portion positioned closer to the second mounting member 12 than the joint portion. As a result, when intermediate-frequency vibrations are input in the axial direction, the portion of the elastic body 13 located closer to the first mounting member 11 than the node portion is actively deformed, and the apparent rigidity of the elastic body 13 is reduced. It is possible to attenuate and absorb this vibration.
Further, according to the vibration isolator 1 according to the present embodiment, it is also possible to reduce intermediate frequency vibrations by controlling the liquid pressure in the main liquid chamber 14 .
For example, when the total area of the holes is the same, the hydraulic pressure in the main liquid chamber 14 when vibration or the like is input differs due to the difference in the shape of the holes provided in the partition member 16 .
Similarly, even when the tubular member 21 is arranged in the partition member 16, the hydraulic pressure in the main fluid chamber 14 differs from the case where the tubular member 21 is not provided when vibration or the like is input.
By using the tubular member 21, the areas of the main liquid chamber 14 are divided in the axial direction and the radial direction of the vibration isolator 1, and the respective areas interact with each other, thereby suppressing medium-frequency vibration unlike the conventional art. can be reduced.

また、複数の第１連通孔４２ａが、第１壁面１６ｂにおいて、筒状部材２１の内側に位置する部分、および筒状部材２１の外側に位置する部分の双方に開口しているので、第１壁面１６ｂに多くの第１連通孔４２ａを配置することが可能になり、例えば低周波振動のうち比較的周波数の高いアイドル振動などを確実に減衰、吸収することができる。
また、筒状部材２１の軸方向の長さが、主液室１４の軸方向の最大高さＴの２０％以上となっているので、軸方向の中周波振動を確実に減衰、吸収することができる。
また、筒状部材２１の内径が、主液室１４の最大内径Ｒの半分以上となっているので、軸方向の中周波振動を確実に減衰、吸収することができる。Further, since the plurality of first communication holes 42a are open to both the portion located inside the tubular member 21 and the portion located outside the tubular member 21 in the first wall surface 16b, the first communication holes 42a It becomes possible to arrange many first communication holes 42a in the wall surface 16b, so that, for example, among low-frequency vibrations, relatively high-frequency idle vibrations can be reliably damped and absorbed.
In addition, since the axial length of the cylindrical member 21 is 20% or more of the maximum axial height T of the main liquid chamber 14, it is possible to reliably attenuate and absorb axial intermediate frequency vibrations. can be done.
Further, since the inner diameter of the tubular member 21 is half or more of the maximum inner diameter R of the main liquid chamber 14, it is possible to reliably attenuate and absorb intermediate frequency vibrations in the axial direction.

次に、本発明に係る第２実施形態について説明するが、第１実施形態と基本的な構成は同様である。このため、同様の構成には同一の符号を付してその説明は省略し、異なる点についてのみ説明する。 Next, a second embodiment according to the present invention will be described, but the basic configuration is the same as that of the first embodiment. For this reason, the same reference numerals are assigned to the same configurations, the description thereof is omitted, and only the points of difference will be described.

本実施形態に係る防振装置２の筒状部材２２では、図３に示されるように、下側から上側に向かうに従い漸次、縮径している。図示の例では、筒状部材２２はドーム状に湾曲して形成されている。なお、筒状部材２２は、下側から上側に向かうに従い漸次、直線状に縮径してもよい。
本実施形態に係る防振装置２によれば、筒状部材２２が、下側から上側に向かうに従い漸次、縮径しているので、軸方向の中周波振動をより一層確実に減衰、吸収することができる。As shown in FIG. 3, the cylindrical member 22 of the anti-vibration device 2 according to this embodiment has a diameter that gradually decreases from the bottom to the top. In the illustrated example, the tubular member 22 is curved in a dome shape. The diameter of the tubular member 22 may be linearly reduced gradually from the lower side to the upper side.
According to the vibration isolator 2 according to this embodiment, the diameter of the cylindrical member 22 is gradually reduced from the bottom to the top, so that the intermediate-frequency vibration in the axial direction can be more reliably damped and absorbed. be able to.

なお、本発明の技術的範囲は前記実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲において種々の変更を加えることが可能である。 The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

前記実施形態では、内側部分１６ｆに開口する第１連通孔４２ａの開口面積の総和を、外側部分１６ｇに開口する第１連通孔４２ａの開口面積の総和より大きくしたが、これに限らず例えば、内側部分１６ｆに開口する第１連通孔４２ａの開口面積の総和を、外側部分１６ｇに開口する第１連通孔４２ａの開口面積の総和以下としてもよい。
また、筒状部材２１が、第１壁面１６ｂに、第１連通孔４２ａと重複しないように連結された構成を示したが、筒状部材２１を、第１壁面１６ｂに、第１連通孔４２ａと重複させて連結してもよい。
また、弾性体１３として、軸方向に延びる筒状に形成された構成を示したが、上下面を有する環状の板状に形成された構成を採用してもよい。
また、仕切部材１６の上壁面に窪み部を形成したが、窪み部を形成しなくてもよい。In the above-described embodiment, the total opening area of the first communication holes 42a opening to the inner portion 16f is larger than the total opening area of the first communication holes 42a opening to the outer portion 16g. The total opening area of the first communication holes 42a opening to the inner portion 16f may be less than or equal to the total opening area of the first communication holes 42a opening to the outer portion 16g.
Further, although the configuration in which the tubular member 21 is connected to the first wall surface 16b so as not to overlap the first communication hole 42a is shown, the tubular member 21 is connected to the first wall surface 16b so as not to overlap the first communication hole 42a. may be overlapped and concatenated with
Further, although the elastic body 13 is formed in a cylindrical shape extending in the axial direction, it may be formed in a ring-like plate shape having upper and lower surfaces.
Also, although the recessed portion is formed in the upper wall surface of the partition member 16, the recessed portion may not be formed.

また、前記実施形態では、支持荷重が作用することで主液室１４に正圧が作用する圧縮式の防振装置１、２について説明したが、主液室１４が鉛直方向下側に位置し、かつ副液室１５が鉛直方向上側に位置するように取り付けられ、支持荷重が作用することで主液室１４に負圧が作用する吊り下げ式の防振装置にも適用可能である。 Further, in the above embodiment, the compression type vibration isolator 1, 2 in which positive pressure acts on the main fluid chamber 14 due to the application of the supporting load has been described. Moreover, it can also be applied to a suspension type anti-vibration device in which the sub-liquid chamber 15 is positioned vertically upward and a negative pressure is applied to the main liquid chamber 14 by the application of a supporting load.

また、本発明に係る防振装置１、２は、車両のエンジンマウントに限定されるものではなく、エンジンマウント以外に適用することも可能である。例えば、建設機械に搭載された発電機のマウントに適用することも可能であり、或いは、工場等に設置される機械のマウントに適用することも可能である。 Moreover, the anti-vibration devices 1 and 2 according to the present invention are not limited to engine mounts of vehicles, and can be applied to other than engine mounts. For example, it can be applied to the mount of a generator mounted on a construction machine, or it can be applied to the mount of a machine installed in a factory or the like.

本発明によれば、仕切部材の第１壁面に、弾性体に向けて突出する筒状部材が配設されているので、軸方向の中周波振動の入力にともない、軸方向に沿う縦断面視において、弾性体が二次の振動モードで変形するときに、従来は弾性体の中央部に生じていた節部分が、例えば、主液室の内周面と筒状部材の外周面との間の液体が流動しにくくなることなどに起因して、第２取付部材側にずれることとなり、弾性体において、節部分より第２取付部材側に位置する部分と比べて、節部分より第１取付部材側に位置する部分が変形しやすくなる。これにより、軸方向の中周波振動の入力時に、弾性体において、節部分より第１取付部材側に位置する部分が積極的に変形することとなり、弾性体の剛性を見かけ上低減することが可能になり、この振動を減衰、吸収することできる。
また、複数の第１連通孔が、第１壁面において、筒状部材の内側に位置する部分、および筒状部材の外側に位置する部分の双方に開口しているので、第１壁面に多くの第１連通孔を配置することが可能になり、例えば低周波振動のうち比較的周波数の高いアイドル振動などを確実に減衰、吸収することができる。According to the present invention, since the cylindrical member protruding toward the elastic body is arranged on the first wall surface of the partition member, when intermediate-frequency vibration is input in the axial direction, , when the elastic body deforms in the secondary vibration mode, the node portion that has conventionally occurred in the central portion of the elastic body is, for example, between the inner peripheral surface of the main liquid chamber and the outer peripheral surface of the cylindrical member. Due to the fact that the liquid of the elastic body becomes difficult to flow, the elastic body is shifted toward the second mounting member side, and the elastic body is located closer to the second mounting member side than the joint portion. The portion located on the member side is easily deformed. As a result, when intermediate-frequency vibrations are input in the axial direction, the portion of the elastic body positioned closer to the first mounting member than the node portion is actively deformed, and the apparent rigidity of the elastic body can be reduced. , and this vibration can be damped and absorbed.
In addition, since the plurality of first communication holes are open to both the portion located inside the tubular member and the portion located outside the tubular member in the first wall surface, the first wall surface has many openings. It becomes possible to dispose the first communication hole, and for example, among low-frequency vibrations, it is possible to reliably attenuate and absorb relatively high-frequency idling vibrations.

ここで、前記筒状部材の軸方向の長さは、前記主液室の軸方向の最大高さの２０％以上となってもよい。
この場合、前述の作用効果が確実に奏功される。Here, the axial length of the cylindrical member may be 20% or more of the maximum axial height of the main liquid chamber.
In this case, the effects described above are reliably achieved.

また、前記筒状部材の内径は、前記主液室の最大内径の半分以上となってもよい。
この場合、前述の作用効果が確実に奏功される。Further, the inner diameter of the cylindrical member may be half or more of the maximum inner diameter of the main liquid chamber.
In this case, the effects described above are reliably achieved.

また、前記筒状部材は、軸方向に沿って前記第１壁面側から前記弾性体側に向かうに従い漸次、縮径してもよい。
この場合、前述の作用効果がより一層確実に奏功される。Further, the diameter of the cylindrical member may be gradually reduced along the axial direction from the first wall surface side toward the elastic body side.
In this case, the effects described above are more reliably achieved.

その他、本発明の趣旨に逸脱しない範囲で、前記実施形態における構成要素を周知の構成要素に置き換えることは適宜可能であり、また、前記した変形例を適宜組み合わせてもよい。 In addition, it is possible to appropriately replace the constituent elements in the above-described embodiment with well-known constituent elements without departing from the spirit of the present invention, and the modifications described above may be combined as appropriate.

本発明の防振装置を当該分野に適用することにより、中周波振動を減衰、吸収することができる。 By applying the anti-vibration device of the present invention to this field, it is possible to attenuate and absorb medium-frequency vibrations.

１、２ 防振装置
１１ 第１取付部材
１２ 第２取付部材
１３ 弾性体
１４ 主液室
１５ 副液室
１６ 仕切部材
１６ｂ 第１壁面
１６ｆ 内側部分（筒状部材の内側に位置する部分）
１６ｇ 外側部分（筒状部材の外側に位置する部分）
１９ 液室
２１、２２ 筒状部材
２４ オリフィス通路
４１ 可動部材
４２ 収容室
４２ａ 第１連通孔
４２ｂ 第２連通孔
Ｏ 中心軸線
Ｒ 最大内径
Ｔ 最大高さ1, 2 vibration isolator 11 first mounting member 12 second mounting member 13 elastic body 14 main liquid chamber 15 sub-liquid chamber 16 partition member 16b first wall surface 16f inner portion (portion located inside the tubular member)
16g outer portion (portion located outside the tubular member)
19 Liquid Chambers 21, 22 Cylindrical Member 24 Orifice Passage 41 Movable Member 42 Storage Chamber 42a First Communication Hole 42b Second Communication Hole O Central Axis R Maximum Inner Diameter T Maximum Height

Claims (4)

振動発生部および振動受部のうちのいずれか一方に連結される筒状の第１取付部材、および他方に連結される第２取付部材と、
これら両取付部材を弾性的に連結する弾性体と、
液体が封入された前記第１取付部材内の液室を、前記弾性体を隔壁の一部に有する主液室および副液室に、前記第１取付部材の中心軸線に沿う軸方向に仕切る仕切部材と、
前記仕切部材に設けられた収容室内に変形可能若しくは変位可能に収容された可動部材と、を備え、
前記仕切部材に、前記主液室と前記副液室とを連通するオリフィス通路と、前記主液室と前記収容室とを連通する複数の第１連通孔と、前記副液室と前記収容室とを連通する第２連通孔と、が形成され、
前記仕切部材において、前記第１連通孔が開口し、かつ前記主液室の内面の一部を構成する第１壁面に、前記弾性体に向けて前記軸方向に突出する筒状部材が配設され、
複数の前記第１連通孔は、前記第１壁面において、前記筒状部材の内側に位置する部分、および前記筒状部材の外側に位置する部分の双方に開口している防振装置。a cylindrical first mounting member connected to one of the vibration generating portion and the vibration receiving portion, and a second cylindrical mounting member connected to the other;
an elastic body that elastically connects both of these mounting members;
A partition that divides a liquid chamber in the first mounting member in which the liquid is sealed into a main liquid chamber and a sub liquid chamber having the elastic body as a part of the partition wall in an axial direction along the central axis of the first mounting member. a member;
a movable member housed in a housing chamber provided in the partition member so as to be deformable or displaceable;
The partition member includes an orifice passage communicating the main liquid chamber and the secondary liquid chamber, a plurality of first communication holes communicating the main liquid chamber and the storage chamber, and the secondary liquid chamber and the storage chamber. and a second communication hole communicating with the
In the partition member, a tubular member projecting in the axial direction toward the elastic body is disposed on a first wall surface on which the first communication hole opens and which constitutes a part of the inner surface of the main liquid chamber. is,
A vibration isolator in which the plurality of first communication holes are open to both a portion located inside the tubular member and a portion located outside the tubular member in the first wall surface. 前記筒状部材の前記軸方向の長さは、前記主液室の前記軸方向の最大高さの２０％以上となっている請求項１に記載の防振装置。 2. The vibration isolator according to claim 1, wherein the axial length of the cylindrical member is 20% or more of the maximum axial height of the main liquid chamber. 前記筒状部材の内径は、前記主液室の最大内径の半分以上となっている請求項１または２に記載の防振装置。 3. A vibration isolator according to claim 1, wherein the inner diameter of said cylindrical member is half or more of the maximum inner diameter of said main liquid chamber. 前記筒状部材は、前記軸方向に沿って前記第１壁面側から前記弾性体側に向かうに従い漸次、縮径している請求項１から３のいずれか１項に記載の防振装置。 4. The vibration isolator according to any one of claims 1 to 3, wherein the diameter of the cylindrical member gradually decreases along the axial direction from the first wall surface side to the elastic body side.
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